/*
 *
 * Copyright (c) 2008, All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Portions of the code may be copied from Google Collections
 * or Apache Commons projects.
 */

package com.coury.dasle.parser.states;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import com.coury.dasle.helper.ParseHelper;
import com.coury.dasle.parser.LineParser;
import com.coury.dasle.parser.Parser;

public class ParseParametersState implements State, MatchCallback {

	private Method currentMethod;
	
	@Override
	public State execute(LineParser parserHolder, Class<? extends Parser> parserClass) throws IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException {
		if (!parserHolder.hasMore()) {
			return null;
		}

		Method[] methods = parserClass.getMethods();
		for (Method method : methods) {
			int parserPos = parserHolder.getCurrentPosition();
			currentMethod = method;
			if (ParseHelper.tryToMatch(parserHolder, method.getName(), this)) {
				break;
			}
			parserHolder.setCurrentPosition(parserPos);
		}

		return new ParseParametersState();
	}

	@Override
	public boolean matched(LineParser parserHolder) throws IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException {
		Class<?>[] parameters = currentMethod.getParameterTypes();
		Object[] values = new Object[parameters.length];
		int n = 0;
		for (Class<?> paramClass : parameters) {
			values[n++] = paramClass.cast(parserHolder.next());
		}
		currentMethod.invoke(parserHolder.getParser(), values);
		return true;
	}

}
